This unit is designed for formation test in water Treatment plants. Sample is easily viewed by Diffused Base Illumination with Florescent Tube placed below plastic & black background.Fitted with DC motor of 1/20 HP with variable speed up to 200 RPM. Control by Speed Regulator provided with stainless Steel paddles with adjustable spacers to adjust the Depth of Paddles. To work on 220/230 volts AC.